Mercury 289 HiPo Specs
Mercury 289 HiPo engine specs: 289 ci (4.7L), 8-cylinder, 4" bore x 2.8701" stroke, 10.5:1 compression.
Dimensions
| Displacement | 289 ci / 4.7 L |
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| Bore | 4" |
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| Stroke | 2.8701" |
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| Cylinders | 8 |
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| Compression ratio | 10.5:1 |
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| Bore/stroke ratio | 1.394 |
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Construction
| Block material | cast iron |
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| Head material | cast iron |
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| Valvetrain | OHV |
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| Fuel type | gas |
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| Advertised HP | 271 hp |
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What these numbers mean
| Bore/stroke character | 1.394 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
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| Mean piston speed at 6,000 RPM | 2,870 ft/min — conservative for a street engine |
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| Displacement per cylinder | 36.1 ci |
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| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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Variants sharing these dimensions (2)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
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| — | 271 hp | 289 HiPo |
| — | 271 hp | 289 HiPo, 289 Hi-Po |
Vehicles (3)
- Mercury Comet
- Mercury Cougar
- Mercury Comet Cyclone
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